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>> Chapter 21, specifying

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three-dimensional
coordinates.

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In this chapter,
we're going to work

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on understanding
3D drawing,

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working with the
3D coordinates,

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and working with the
elevation and thickness,

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creating a custom

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User Coordinate System
for 3D drawing.

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Before, we were
working always in

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the x and y space or axis.

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In this chapter, we
are adding z-axis.

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In this Figure 21.1,
as you can see,

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on the left image is

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a top view or floor
plan of a building,

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and the right view
is a perspective.

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Working in three-dimensional
environment.

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So either you can open
a template file as

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acad3D or you can change

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the workspace to
three-dimensional space.

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Here on AutoCAD,

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there is a workspace

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and next to the
Quick Access view.

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Drafting annotation,

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it means two-dimensional
drawing.

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Switch that one
to 3D modeling.

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You can see the panels

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and ribbons are changing.

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If you don't have
a workspace,

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you can find this
drop-down arrow

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and look for
the workspace.

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We are now in the
3D modeling space.

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Under view, you can

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see viewport toolbars

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and unsaved view,

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or you can see in
the isometric views;

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Southwest isometric,

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Southeast isometric,
Northeast isometric.

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Click on that one. We are

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on the Northeast
isometric.

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And even the view cube,

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you have a chance to
switch the views.

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In the 3D modeling,

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I'm going back
to Home tab,

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we have three types
of modeling; solid,

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surface, mesh,

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and we are planning
to work on the

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solid and mesh
in this class.

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Under Home, we have

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x and y and
additional z-axis.

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Now we are on the World
Coordinate System.

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For example, if I draw

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a box and change

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the visual style
conceptual,

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I'm going to change
the coordinate.

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Here under the tab, there

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is a coordinates panel.

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If I change the
coordinates to the front,

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can you see the
difference on

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the direction
of the x-axis,

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and y-axis, and z-axis?

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So that's how we

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are changing the
coordinates,

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and it's called User
Coordinate System.

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Switching to the right,
under Coordinates,

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I'm going to change the
coordinates to top.

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So top is like

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a World Coordinate
System for us now.

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So the origin is
changing every

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time. One more time.

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Front, you can
see the x, and y,

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and z-axis,
right, x and y,

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and z-axis, and left,

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top,

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and the bottom.

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So why do we need access

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to change the coordinates?

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The reason that
we need to change

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the coordinate
is, for example,

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if I'm planning to draw

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something on
the left view,

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from the Home tab
drawing panel circle.

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When I move my mouse,
on the left view,

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I have a chance to
draw that circle

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exactly on the left view.

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I'm going back to World
Coordinate System.

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I'm changing the
visual style

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to 2D wireframe and

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now we are going
to start working

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on Exercise
AB21-A DWG file.

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So from Canvas,
please download

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a File AB21-A and
open that file.

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And also from the book,

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you can see the
steps for drawing

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the

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3D coordinates,

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using 3D coordinates.

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So I'm going to
follow the steps

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from this book
on Page 664.

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On desktop, I
created ENT 135.

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So here I have my DWG
Bible book drawing.

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There's AB21-A here.

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I'm going to open
File AB21-A.

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It's an empty file.

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So I'm going to
save as this file

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back to Assignment

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21A-01.

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Steps using 3D
coordinates.

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Open File AB21-A DWG
from the Canvas site.

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This exercise, assume that

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you have a dynamic
input turn

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on set to the default
of relative coordinate.

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The drawing used

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a two-dimensional
environment.

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It looks like
three-dimension environment.

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So I'm going back
to two-dimension.

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Save it as AB21-1 in
your assignment folder.

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Choose a home type,

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drawing panel rectangular,

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and create a rectangle.

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Start a rectangle
comment at

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the specifying first
corner rectangle.

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Type 0,

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0, 19.

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Press "Enter".

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At the specified
other corner type

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39, 15, "Enter".

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This creates a
rectangle 39 units

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by 15 units wide.

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That is 19 units above
the x and y-plane.

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Notice that you omit

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the z-coordinate for
the second corner.

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Choose a home tab,

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modify panel,
copy to start.

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We're going to copy

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the rectangle two units

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above the original
rectangle.

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So select the rectangle,

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select object,
press "Enter",

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and type 0,

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0, 2, "Enter".

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Press "Enter" to get
out of the command.

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You have two
rectangles but

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because you are
looking from

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top, you see only one.

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So we are going to

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Home tab view panel

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3D navigation
dropdown list

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and choose Southeast
isometric.

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Now you can see
two rectangles.

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If object snap is
not turned on,

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click on the
"Object Snap".

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Remember object snap?

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Set the running object
snap to endpoint.

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I'm going to turn off
the rest of them.

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Start the line command
and check on here.

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We should be following
Figure 21.6.

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I'm in the Step 7,

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going back to our
figure drawing.

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Start Home tab line.

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From Point 1,

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pick endpoint at Point 1.

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So second point or
specifying next point,

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type pound, 0,

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0, 0, "Enter".

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Specifying next point, 1,

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0, 0, "Enter".

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Specifying next point, 0,

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0, 21, "Enter"
and "Enter".

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We need to copy
these three lines.

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Press "Enter".

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From the endpoint,

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type 38, 0, 0, "Enter".

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Means 38 units
to the right.

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I can just copy
those two legs all

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the way to the extraction,

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to the y direction to
back of the table.

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So copy. Either I

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can just copy
from here to here

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or I could just add 15 for

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the coordinates
and it would

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copy the legs all
the way to the back.

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Actually, it's
a piano bench.

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To draw an open cover
for the piano bench,

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we need to start a
line again, line.

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Start at the
endpoint at Point 2.

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Here is a Point
2 from the book.

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And specifying next point,

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type 15 with the angle of

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90 and the angle

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of 45. Press "Enter".

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And turn on the
Ortho mode or F8.

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Make sure you go
straight all the

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way and type 39,

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is the same way of
drawing a line.

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And also, you
can all the way

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down and close this door

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by finishing with
the endpoint

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of the left corner or
Point 3 from the book.

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The last line is going
to be the bracing.

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This line. So you're

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going to have to
start the line.

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Starting point is
going to be Number

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4 to Number 3,

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or you can use coordinates

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of 15 with the
angle of 20,

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2 as a z-axis.

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Press "Enter". As you see,

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our drawing is in the
three-dimensional view.

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Don't forget to
save your file.